I've been using WHS 2011 since it was released. In all that time I have disabled sleep on all of my computers because of bad experiences with sleep functions many years ago before it really worked right.
After replacing a computer a few days ago I decided to allow Windows to use the sleep functionality on the new computer and I reconfigured an existing one to use it. Seems to work just fine, except that backups to WHS 2011 are not happening even though I have the wake up for backup option selected in Launchpad. I also ensured that the power management options have wake timers allowed, but no new backups.
One PC is a laptop and the other is a tablet PC (a Samsung Series 7 Slate), and both are running Windows 8.1.
What settings do I need to triple-check to make sure the computers wake up to do backups?